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The basic format is $array['key'], but if you have layers then you can just add it to the end.

Or, look at it like this:
$temp = $array['key'];
$temp['anotherkey'];

(There are two words for the name that refers to the subpart of the array, either a "key" or an "index". Usually a "key" refers to when you are looping through the array to find specific entries, and an index refers to when you name it that, but they actually mean the same thing, effectively.)